-20+r=-4r

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Solution for -20+r=-4r equation: 



-20+r=-4r

We move all terms to the left:

-20+r-(-4r)=0

We get rid of parentheses

r+4r-20=0

We add all the numbers together, and all the variables

5r-20=0

We move all terms containing r to the left, all other terms to the right

5r=20

r=20/5

r=4

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